This is too general a question to give much useful advice. See perhaps the guerry r package and associated vignette for some examples. Also see this answer by whuber to a different question (that gives extension r tutorials of PCA - albeit geographically weighted PCA).
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Andy WJan 14 '13 at 18:20

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Most of this sounds routine when you break it into its component steps: your PCA produces an ordered triple of eigenvalues at a discrete set of sample points. You will interpolate them (separately or with a vector procedure such as cokriging) onto three grids. What is unclear is how you propose to "combine" those three grids. Could you perhaps indicate the purpose of this exercise?
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whuber♦Jan 14 '13 at 19:01